On mine, the end was folded back over it self and sewed down (with a hole for the tongue) with 4 loops of thread--both sides of the loop on top and bottom.

I cut those threads, cut off a few inches, used the utility knife to cut a new hole, folded it back over, opened up little holes with an awl and then used approximately as much thread as was originally used to sew it back up.

Only snags were as follows: somehow I managed to get the hole for the tongue slightly off center. It is not noticable when the belt is on (since the end of the belt covers it). Other snag was that the belt was lined which mad folding it over look bad. To solve this, I actually cut out the back of the part that would be folded over and stripped out the lining (but I own other belts where you could get away without doing this).

It was a pretty quick job...but I would bet a cobbler could do it much nicer for pretty cheap.